fix_xmap and refine flowers dataset

python/paddle/v2/dataset/__init__.py

@@ -25,8 +25,9 @@ import uci_housing
 import sentiment
 import wmt14
 import mq2007
+import flowers
 
 __all__ = [
     'mnist', 'imikolov', 'imdb', 'cifar', 'movielens', 'conll05', 'sentiment'
-    'uci_housing', 'wmt14', 'mq2007'
+    'uci_housing', 'wmt14', 'mq2007', 'flowers'
 ]

python/paddle/v2/dataset/flowers.py

@@ -34,9 +34,9 @@ from common import download
 import tarfile
 import scipy.io as scio
 from paddle.v2.image import *
+from paddle.v2.reader import *
 import os
 import numpy as np
-import paddle.v2 as paddle
 from multiprocessing import cpu_count
 __all__ = ['train', 'test', 'valid']
 
@@ -53,8 +53,8 @@ def default_mapper(sample):
     map image bytes data to type needed by model input layer
     '''
     img, label = sample
-    img = paddle.image.load_image_bytes(img)
-    img = paddle.image.simple_transform(img, 256, 224, True)
+    img = load_image_bytes(img)
+    img = simple_transform(img, 256, 224, True)
     return img.flatten().astype('float32'), label
 
 
@@ -63,7 +63,8 @@ def reader_creator(data_file,
                    setid_file,
                    dataset_name,
                    mapper=default_mapper,
-                   buffered_size=1024):
+                   buffered_size=1024,
+                   useXmap=True):
     '''
     1. read images from tar file and
         merge images into batch files in 102flowers.tgz_batch/
@@ -105,11 +106,13 @@ def reader_creator(data_file,
             for sample, label in itertools.izip(data, batch['label']):
                 yield sample, int(label)
 
-    return paddle.reader.xmap_readers(mapper, reader,
-                                      cpu_count(), buffered_size)
+    if useXmap:
+        return xmap_readers(mapper, reader, cpu_count(), buffered_size)
+    else:
+        return map_readers(mapper, reader)
 
 
-def train(mapper=default_mapper, buffered_size=1024):
+def train(mapper=default_mapper, buffered_size=1024, useXmap=True):
     '''
     Create flowers training set reader.
     It returns a reader, each sample in the reader is
@@ -128,11 +131,11 @@ def train(mapper=default_mapper, buffered_size=1024):
     return reader_creator(
         download(DATA_URL, 'flowers', DATA_MD5),
         download(LABEL_URL, 'flowers', LABEL_MD5),
-        download(SETID_URL, 'flowers', SETID_MD5), 'trnid', mapper,
-        buffered_size)
+        download(SETID_URL, 'flowers', SETID_MD5), 'tstid', mapper,
+        buffered_size, useXmap)
 
 
-def test(mapper=default_mapper, buffered_size=1024):
+def test(mapper=default_mapper, buffered_size=1024, useXmap=True):
     '''
     Create flowers test set reader.
     It returns a reader, each sample in the reader is
@@ -151,11 +154,11 @@ def test(mapper=default_mapper, buffered_size=1024):
     return reader_creator(
         download(DATA_URL, 'flowers', DATA_MD5),
         download(LABEL_URL, 'flowers', LABEL_MD5),
-        download(SETID_URL, 'flowers', SETID_MD5), 'tstid', mapper,
-        buffered_size)
+        download(SETID_URL, 'flowers', SETID_MD5), 'trnid', mapper,
+        buffered_size, useXmap)
 
 
-def valid(mapper=default_mapper, buffered_size=1024):
+def valid(mapper=default_mapper, buffered_size=1024, useXmap=True):
     '''
     Create flowers validation set reader.
     It returns a reader, each sample in the reader is
@@ -175,7 +178,7 @@ def valid(mapper=default_mapper, buffered_size=1024):
         download(DATA_URL, 'flowers', DATA_MD5),
         download(LABEL_URL, 'flowers', LABEL_MD5),
         download(SETID_URL, 'flowers', SETID_MD5), 'valid', mapper,
-        buffered_size)
+        buffered_size, useXmap)
 
 
 def fetch():

python/paddle/v2/dataset/tests/flowers_test.py

@@ -31,13 +31,13 @@ class TestFlowers(unittest.TestCase):
     def test_train(self):
         instances, max_label_value = self.check_reader(
             paddle.v2.dataset.flowers.train())
-        self.assertEqual(instances, 1020)
+        self.assertEqual(instances, 6149)
         self.assertEqual(max_label_value, 102)
 
     def test_test(self):
         instances, max_label_value = self.check_reader(
             paddle.v2.dataset.flowers.test())
-        self.assertEqual(instances, 6149)
+        self.assertEqual(instances, 1020)
         self.assertEqual(max_label_value, 102)
 
     def test_valid(self):

python/paddle/v2/reader/decorator.py

@@ -248,9 +248,6 @@ def xmap_readers(mapper, reader, process_num, buffer_size, order=False):
     :rtype: callable
     """
     end = XmapEndSignal()
-    in_queue = Queue(buffer_size)
-    out_queue = Queue(buffer_size)
-    out_order = [0]
 
     # define a worker to read samples from reader to in_queue
     def read_worker(reader, in_queue):
@@ -266,12 +263,6 @@ def xmap_readers(mapper, reader, process_num, buffer_size, order=False):
             in_order += 1
         in_queue.put(end)
 
-    # start a read worker in a thread
-    target = order_read_worker if order else read_worker
-    t = Thread(target=target, args=(reader, in_queue))
-    t.daemon = True
-    t.start()
-
     # define a worker to handle samples from in_queue by mapper
     # and put mapped samples into out_queue
     def handle_worker(in_queue, out_queue, mapper):
@@ -298,6 +289,15 @@ def xmap_readers(mapper, reader, process_num, buffer_size, order=False):
         in_queue.put(end)
         out_queue.put(end)
 
+    def xreader():
+        in_queue = Queue(buffer_size)
+        out_queue = Queue(buffer_size)
+        out_order = [0]
+        # start a read worker in a thread
+        target = order_read_worker if order else read_worker
+        t = Thread(target=target, args=(reader, in_queue))
+        t.daemon = True
+        t.start()
         # start several handle_workers
         target = order_handle_worker if order else handle_worker
         args = (in_queue, out_queue, mapper, out_order) if order else (
@@ -310,7 +310,6 @@ def xmap_readers(mapper, reader, process_num, buffer_size, order=False):
         for w in workers:
             w.start()
 
-    def xreader():
         sample = out_queue.get()
         while not isinstance(sample, XmapEndSignal):
             yield sample

python/paddle/v2/reader/tests/decorator_test.py

@@ -132,10 +132,12 @@ class TestXmap(unittest.TestCase):
         for order in orders:
             for tNum in thread_nums:
                 for size in buffered_size:
-                    result = []
-                    for i in paddle.v2.reader.xmap_readers(mapper,
+                    reader = paddle.v2.reader.xmap_readers(mapper,
                                                            reader_creator_10(0),
-                                                           tNum, size, order)():
+                                                           tNum, size, order)
+                    for n in xrange(3):
+                        result = []
+                        for i in reader():
                             result.append(i)
                         if not order:
                             result.sort()